WO2007018067A1 - 遷移金属錯体化合物及びそれを用いた有機エレクトロルミネッセンス素子 - Google Patents
遷移金属錯体化合物及びそれを用いた有機エレクトロルミネッセンス素子 Download PDFInfo
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- WO2007018067A1 WO2007018067A1 PCT/JP2006/315163 JP2006315163W WO2007018067A1 WO 2007018067 A1 WO2007018067 A1 WO 2007018067A1 JP 2006315163 W JP2006315163 W JP 2006315163W WO 2007018067 A1 WO2007018067 A1 WO 2007018067A1
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- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
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- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
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- 229910052725 zinc Inorganic materials 0.000 description 1
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- C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
- C07D233/56—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms
- C07D233/58—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring nitrogen atoms
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- C07D233/54—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
- C07D233/64—Heterocyclic compounds containing 1,3-diazole or hydrogenated 1,3-diazole rings, not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with substituted hydrocarbon radicals attached to ring carbon atoms, e.g. histidine
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- C07D235/04—Benzimidazoles; Hydrogenated benzimidazoles
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Definitions
- the present invention relates to a transition metal complex compound and an organic electroluminescent device using the same, and in particular, an organic electroluminescent device that emits blue light with high luminous efficiency and a novel device that realizes the organic electroluminescent device.
- the present invention relates to a transition metal complex compound.
- Organic electoluminescence (EL) devices use the principle that a fluorescent substance emits light by recombination energy of holes injected from an anode and electrons injected from a cathode by applying an electric field. Self-luminous element. Report of low-voltage driven organic EL devices using stacked devices by Eastman Kodak's CW Tang et al. (CW Tang, SA Vanslyke, Applied Physics Letters, 51 ⁇ , 913, 1987, etc.) ) Since then, research on organic EL devices using organic materials as constituent materials has been actively conducted. Tang et al. Used tris (8-hydroxyquinolinol aluminum) for the light-emitting layer and triphenyldiamine derivative for the hole-transporting layer.
- the advantages of the stacked structure are that it increases the efficiency of hole injection into the light-emitting layer, blocks the electrons injected from the cathode, and increases the generation efficiency of excitons generated by recombination. For example, confining excitons.
- the device structure of the organic EL device includes a hole transport (injection) layer, a two-layer type of an electron transport light-emitting layer, or a hole transport (injection) layer, a light-emitting layer, and an electron transport (injection).
- the three-layer type is well known.
- the structure of the element and the formation method have been devised.
- the light-emitting material of the organic EL element is a tris (8-quinolinolato) aluminum complex.
- Luminescent materials such as chelate complexes, coumarin derivatives, tetraphenylbutadiene derivatives, distyrylarylene derivatives, oxadiazole derivatives, etc. are known, and it has been reported that they can emit light in the visible region from blue to red. Therefore, it is expected to realize a color display element (see, for example, Patent Document 1, Patent Document 2, Patent Document 3, etc.).
- the triplet excited state or triplet exciton is not sequentially quenched so that the anode, the hole transport layer, the organic light emitting layer, the electron transport layer (hole blocking layer),
- a structure in which layers are stacked such as an electron transport layer and a cathode has been used, and a host compound and a phosphorescent compound have been used for an organic light emitting layer (see, for example, Patent Document 4 and Patent Document 5).
- These patent documents are technologies related to phosphorescent materials that emit red to green light.
- a technique related to a light emitting material having a blue emission color is also disclosed (see, for example, Patent Document 6, Patent Document 7, and Patent Document 8).
- Patent Documents 7 and 8 describe a ligand skeleton in which an Ir metal and a phosphorus atom are bonded, and these emit light blue but have weak bonds. The heat resistance is extremely poor.
- Patent Document 9 similarly describes a complex in which an oxygen atom and a nitrogen atom are bonded to the central metal, but there is no description about the specific effect of the group bonded to the oxygen atom, and it is unclear.
- Patent Document 10 discloses a complex in which nitrogen atoms contained in different ring structures are bonded to a central metal one by one. A device using the same emits blue light, but the external quantum efficiency is about 5%. It is low.
- a carbene is a two-coordinate carbon that has two electrons in the sp 2 hybrid orbit and the 2p orbit, and the combined force of the orbit into which the two electrons enter and the spin direction can have four types of structures.
- carbene complexes are short-lived 'unstable, and are intermediates or organic intermediates in organic synthesis reactions. Power that has been used as a synthetic conversion reagent such as addition to refin Around 1991, stable carbene complexes consisting of aromatic heterocyclic structures and stable carbene complexes consisting of non-aromatic cyclic structures were discovered.
- the acyclic carbene complex was stably obtained by stabilizing with nitrogen and phosphorus.
- the catalytic performance is improved by combining it with a transition metal as a ligand, in recent years, expectations for a stable carbene complex have increased in the catalytic reaction in organic synthesis.
- complexes having a carbene iridium bond include the following non-patent document 12 (tris (carbene) iridium complex that also has a non-heterocyclic carbene ligand force) and non-patent document 13 (monodentate coordination type mono-). Carbene iridium complex), but the application to the organic EL device field is described.
- Patent Document 11 discloses the synthesis of an iridium complex having a carbene bond and its emission wavelength and device performance.
- the force energy efficiency, external quantum efficiency are low, and the emission wavelength is distributed in the ultraviolet region.
- the visual efficiency is poor. Therefore, it is not suitable for light-emitting devices in the visual wavelength range such as organic EL.
- impurities could be mixed during device fabrication because vacuum deposition could not be performed because the decomposition temperature was low or the molecular weight was high, and the complex was decomposed during the deposition.
- Patent Documents 12 to 20 have descriptions relating to complexes having various carbene bonds, and blue light emitting complexes are disclosed. However, energy efficiency and external quantum efficiency are low, and neither of them mentions the extension of the light emission lifetime.
- Patent Documents 21 and 22 describe three 3-phenylpyridine-N, C 2 group sites as a method for extending the lifetime of tris (2-phenylpyridine-N, C 2 ) iridium complex. Although it is disclosed that a leg-shaped bridge is used, only a tripod-type cross-linking site having a benzene ring skeleton has been reported. Guidelines Is not shown.
- Patent Document 1 Japanese Patent Laid-Open No. 8-239655
- Patent Document 2 JP-A-7-183561
- Patent Document 3 Japanese Patent Laid-Open No. 3-200289
- Patent Document 4 U.S. Patent No. 6,097,147
- Patent Document 5 International Publication WO01Z41512
- Patent Document 6 US2001Z0025108 Publication
- Patent Document 7 US 2002/0182441 Publication
- Patent Document 8 Japanese Patent Laid-Open No. 2002-170684
- Patent Document 9 Japanese Unexamined Patent Publication No. 2003-123982
- Patent Document 10 Japanese Unexamined Patent Publication No. 2003-133074
- Patent Document 11 International Publication WO05Z019373
- Patent Document 12 US2005Z0258433 Publication
- Patent Document 13 US2005Z0258742 Publication
- Patent Document 14 US2005Z0260441 Publication
- Patent Document 15 US2005Z0260444 Publication
- Patent Document 16 US2005Z0260445 Publication
- Patent Document 17 US2005Z0260446 Publication
- Patent Document 18 US2005Z0260447 Publication
- Patent Document 19 US2005Z0260448 Publication
- Patent Document 20 US2005Z0260449 Publication
- Patent Document 21 US2005Z0170206 Publication
- Patent Document 22 US 2005Z0170207 Publication
- Non-Patent Document 1 D. F. OBrien and M. A. Baldo et al "lmproved energy tr ansferin electrophosphorescent devices" Vol. 74 No. 3, pp 442-444, Januaryl8, 1999
- Non-Patent Document 2 MA Baldo et al Very high-efficiency green organic li ght -emitting devices based on electrophosphorescence "Applied Phys ics letters Vol. 75 No. 1, pp4-6, July 5, 1999
- Non-Patent Document 3 Chem. Rev. 2000, 100, p39
- Non-Patent Document 4 Am. Chem. Soc., 1991, 113, p361
- Non-Patent Document 5 Angew. Chem. Int. Ed., 2002, 41, pi 290
- Non-Patent Document 6 Am. Chem. Soc., 1999, 121, p2674
- Non-Patent Document 7 Organometallics, 1999, 18, p2370
- Non-Patent Document 8 Angew. Chem. Int. Ed., 2002, 41, pl363
- Non-Patent Document 9 Angew. Chem. Int. Ed., 2002, 41, pi 745
- Non-Patent Document 10 Organometallics, 2000, 19, p3459
- Non-patent literature ll TetrahedronAymmetry, 2003, 14, p951
- Non-Patent Document 12 Organomet. Chem., 1982, 239, C26-C30
- Non-Patent Document 13 Chem. Commun., 2002, ⁇ 2518
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide an organic EL device that emits blue light with high luminous efficiency and a novel transition metal complex compound that realizes the organic EL device. To do.
- the present inventors have made the emission wavelength longer by linking (crosslinking) the ligand of the complex in the transition metal complex compound. I found out that This phenomenon is useful as a technique that can adjust the emission wavelength to a desired one, and is particularly useful for leading a material having an emission wavelength in the ultraviolet region to a material having emission in the blue region (visual wavelength region). Can be enlarged). By using this technology, it was found that a blue light-emitting organic EL device with high luminous efficiency was obtained, and the present invention was completed.
- the present invention relates to a transition metal complex compound having a ligand having a tridentate or higher coordination site, which is a combination force of a covalent bond and a cage or a coordination bond, and a shared bond and a cage. Or the coordination force of coordination bond
- the transition metal complex compound which has a ligand which has this is provided.
- the present invention also provides a transition metal complex compound having a metal carbene bond represented by the following general formula (1) or (6).
- the bond indicated by a solid line (1) indicates a covalent bond
- the bond indicated by an arrow ( ⁇ ) indicates a coordinate bond
- L 2 ⁇ M and L 4 ⁇ M At least one of them shows a metal carbene bond.
- M represents a metal atom of iridium (Ir) or platinum (Pt).
- L 5 and L 6 are each independently a monodentate ligand or a bridged bidentate ligand in which L 5 and L 6 are bridged (L 5 — L 6) indicates, as L 1 and L 3, L 1 and L 4, L 2 and L 3, L 2 and L 4, L 1 and L 5, L 1 and L 6, L 2 and L 5, L 2 At least one of L 6 , L 3 and L 5 , L 3 and L 6 , L 4 and L 5 and L 4 and L 6 is a bridging group Z 1 — (Z 1 is an aromatic hydrocarbon, heterocyclic ring Group, alkane, alkene, and these carbon atoms are replaced by the substitution of the carbon atom, nitrogen atom, sulfur atom, oxygen atom, phosphorus atom, and boron atom.
- Z 1 is an aromatic hydrocarbon, heterocyclic ring Group, alkane, alkene, and these carbon atoms are replaced by the substitution of the carbon atom, nitrogen atom, sulfur atom, oxygen atom, phosphorus atom
- L 1 and L 3 are each independently a divalent aromatic hydrocarbon group having 6 to 30 nuclear carbon atoms which may have a substituent, or a nuclear atom number having 3 to 30 which may have a substituent. It may have a divalent heterocyclic group or a substituent, or it may have a divalent carboxyl-containing group or substituent having 1 to 30 carbon atoms!
- the divalent amino group may have a hydroxyl group-containing hydrocarbon group or a substituent!
- L 2 and L 4 are each independently a monovalent group having a carbene carbon which may have a substituent, or a monovalent aromatic hydrocarbon having 6 to 30 nuclear carbon atoms which may have a substituent. Is a monovalent heterocyclic group having 3 to 30 nuclear atoms which may have a substituent, and at least one of L 2 and L 4 may have a substituent, and has a carbene carbon It is a monovalent group.
- L 5 is a monovalent aromatic hydrocarbon group having 6 to 30 nuclear carbon atoms which may have a substituent, or a monovalent heterocyclic group having 3 to 30 nucleus atoms which may have a substituent.
- L 5 and L 6 are bridged, a divalent group of each of the above groups,
- L 6 is a heterocyclic ring having 3 to 30 nuclear carbon atoms which may have a substituent, a carboxylic acid ester having 1 to 30 carbon atoms which may have a substituent, a carboxylic acid amide having 1 to 30 carbon atoms, May have a substituent, phosphine which may have a substituent, iso-tolyl which may have a substituent, an ether having 1 to 30 carbon atoms.
- a thioether having 1 to 30 carbon atoms, or a compound having a double bond having 1 to 30 carbon atoms, and L 5 and L 6 are cross-linked. In this case, it is a monovalent group of each ligand.
- A is a bridged bidentate group consisting of L 11 — (Z 11 ) — L 12 and B is L 13 d
- L 11 —, L 13 —, and L 15 — are shared bonds to Ir (iridium) (L 11 — Ir, L 13 -Ir3 ⁇ 4 ⁇ L 15 -Ir) ⁇ L, L 12 ⁇ , L " ⁇ and L 16 ⁇ represents coordination bonds to Ir (L 12 ⁇ Ir, L ′′ ⁇ Ir and L 16 ⁇ Ir), respectively.
- X 1 is a bridging group having 1 to 18 atoms and an acyclic structural force, and is a group of hydrogen atoms, carbon atoms, silicon atoms, nitrogen atoms, sulfur atoms, oxygen atoms, phosphorus atoms and boron atoms.
- Y 1 is X and A
- Y 2 is X and B
- Y 3 is a bridging group that bonds X and C
- Y 1 is L U , L 12 or Z U
- Y 2 is L 13 , L 14 or Z 12
- Y 3 is bonded to L 15 , L 16 or Z 13 .
- ⁇ 2 and ⁇ 3 are independently 2 of a compound composed of an atom selected from the group consisting of a hydrogen atom, a carbon atom, a silicon atom, a nitrogen atom, a sulfur atom, an oxygen atom, a phosphorus atom and a boron atom. It is a valent residue and may have a substituent.
- a, b and c each independently represent an integer of 0 to 0, and when a, b or c is plural, Upsilon 2 or Upsilon 3 may be the same or different.
- ⁇ 11 is L 11 and L 12
- Z 12 is L 13 and L "
- Z 13 is a bridging group that bonds L 15 and L 16
- ⁇ ⁇ 12 and ⁇ 13 are independently hydrogen atom, carbon It is a divalent residue of a compound composed of atoms selected from the group consisting of atoms, silicon atoms, nitrogen atoms, sulfur atoms, oxygen atoms, phosphorus atoms, and boron atoms, and may have a substituent.
- z u, z 12 and Z 13 correspond, respectively it 3 D, e and f each independently represents an integer of 0 to 0, and when d, e or f is plural, plural z u , z 12 or Z 13 may be the same It may be different.
- L U , L 13 and L 15 are each independently a divalent aromatic hydrocarbon group having 6 to 30 nuclear carbon atoms which may have a substituent, or a nuclear atom number which may have 3 substituents. May have a divalent heterocyclic group or substituent of ⁇ 30, may have a divalent carboxyl-containing group having 1 to 30 carbon atoms, or may have a substituent V ⁇ a divalent amino group or hydroxyl group May contain hydrocarbon groups and substituents!
- L 12 , L 14 and L 16 are each independently a monovalent group having a carbene carbon which may have a substituent, or a monovalent group having 3 to 30 nuclear atoms which may have a substituent.
- L 12 , L 14 and L 16 are heterocyclic groups when L 12 is directly bonded to Y 1 , L 14 is directly bonded to Y 2 , or L 16 is directly bonded to Y 3 is a divalent group corresponding respectively.
- the present invention provides an organic EL device in which an organic thin film layer composed of one or more layers having at least a light emitting layer is sandwiched between an anode and a cathode, wherein at least one of the organic thin film layers is An organic EL device containing a transition metal complex compound is provided.
- the organic EL device using the transition metal complex compound of the present invention emits blue light with high luminous efficiency and long luminous lifetime.
- FIG. 1 is a diagram showing a 1 H-NMR spectrum of metal complex compound 1 obtained in Example 1.
- FIG. 2 is a diagram showing a 1 H-NMR spectrum of Comparative Compound 1 obtained in Comparative Example 1.
- FIG. 3 is a diagram showing a 1 H-NMR spectrum of Comparative Compound 2 obtained in Comparative Example 2.
- FIG. 4 is a graph showing emission spectra of metal complex compound 1, comparative compound 1 and comparative compound 2.
- the present invention relates to a transition metal complex compound having a ligand having a tridentate or higher coordination site, which is a combination force of a covalent bond and Z or coordination bond, and a covalent bond and Z or coordination bond. Coordination with four or more coordinate positions It is a transition metal complex compound having a child. It is preferable that the transition metal complex compound has a metal carbene bond, and the metal force S iridium of the transition metal complex compound is preferable.
- transition metal complex compound examples include a transition metal complex compound having a metal carbene bond represented by the following general formula (1) or (6).
- the bond indicated by the solid line (one) indicates a covalent bond
- the bond indicated by the arrow ( ⁇ ) indicates a coordinate bond
- L 2 ⁇ M and L 4 ⁇ M At least one of them shows a metal carbene bond.
- M represents a metal atom of iridium (Ir) or platinum (Pt), and Ir is preferable.
- L 1 — L 2 and L 3 — L 4 represent bridged bidentate ligands
- L 5 and L 6 are each independently a monodentate ligand or L 5 and L 6 are
- a bridged bidentate ligand (L 5 — L 6 ) is shown.
- At least one of L 3 and L 5 , L 3 and L 6 , L 4 and L 5, and L 4 and L 6 is cross-linked through a cross-linking group — 1 .
- each L 5 and L 6 may be the same or different and may be cross-linked with each other adjacent to each other.
- Z 1 is an aromatic hydrocarbon, a heterocyclic group, an alkane, an alkene, and these carbon atoms replaced by any of a silicon atom, a nitrogen atom, a sulfur atom, an oxygen atom, a phosphorus atom, and a boron atom. It is a cross-linkage via a compound selected or a divalent residue having a combination force, which may have a substituent. Cross-linking group—Z 1 If there is more than one, each may be the same or different.
- Z 1 include an a, ⁇ alkylene bridging group having 1 to 20 carbon atoms, an ⁇ alkylene bridging group having an ether bond having 1 to 20 carbon atoms, and a thioether bond having 1 to 20 carbon atoms (X, ⁇ A, ⁇ alkylene bridging group having a carbon chain bond with 1 to 20 carbon atoms, a, ⁇ alkylene bridging group having a carbon nitrogen bond with 1 to 20 carbon atoms, carbon phosphorus with 1 to 20 carbon atoms Oc having a bond, ⁇ alkylene bridging group, oc having a carbon-carbon double bond having 1 to 20 carbon atoms, ⁇ alkylene bridging group, oc having a carbon-carbon triple bond having 1 to 20 carbon atoms, ⁇ alkylene bridging group, A, ⁇ alkylene bridging group having an arylene group having 1 to 20 carbon atoms, a, ⁇ alkylene bridging group having a
- a halogenated alkyl group having 1 to 30 carbon atoms, a substituent, an aromatic hydrocarbon group having 6 to 30 nuclear carbon atoms, and a cycloalkyl having 3 to 30 nuclear carbon atoms optionally having a substituent May have a group, a substituent, a C 7-40 aralkyl group, a substituent, a C 2-30 alkenyl group, or a nuclear atom that may have a substituent It may have a 3-30 heterocyclic group, a substituent, V, an alkoxy group having 1-30 carbon atoms, a substituent, an aryloxy group having 6-30 nuclear carbon atoms, or a substituent.
- An alkylamino group having 3 to 30 nuclear atoms which may have an alkylamino group or a substituent, an alkylsilyl group having 3 to 30 nuclear atoms, or a substituent.
- 30 Arirushiriru group, a carboxyl-containing group having 1 to 30 carbon atoms, is no to be limited thereto. Specific examples of these groups are the same as described below. Among these, a halogen atom or a compound composed of only a carbon atom and a hydrogen atom is preferable.
- Zeta 1 examples include the following structures (* indicates the position of the binding, were example, the following (a) is 1, means 2-ethylene bridge.)
- L 1 and L 3 each independently have a divalent aromatic hydrocarbon group having 6 to 30 nuclear carbon atoms and a substituent which may have a substituent.
- a divalent heterocyclic group having 3 to 30 nucleus atoms, a divalent carboxyl-containing group having 1 to 30 carbon atoms which may have a substituent, and a divalent group having a substituent. May have an amino group or a hydroxyl group-containing hydrocarbon group or a substituent, may be a cycloalkylene group having 3 to 50 nuclear carbon atoms, or may have a substituent, an alkylene group having 1 to 30 carbon atoms, or a substituent.
- L 2 and L 4 are each independently a monovalent group having a carbene carbon which may have a substituent, or a nuclear carbon which may have a substituent.
- L 5 is a monovalent aromatic hydrocarbon group having 6-30 nuclear carbon atoms which may have a substituent, and 3-30 nuclear atoms optionally having a substituent.
- a monovalent heterocyclic group a monovalent carboxyl group having 1 to 30 carbon atoms which may have a substituent, a monovalent amino group or a hydroxyl group-containing hydrocarbon group which may have a substituent, and a substituent; May have a cycloalkyl group having 3 to 50 nuclear carbon atoms, an optionally substituted alkyl group having 1 to 30 carbon atoms, may have a substituent, V, and a alkke having 2 to 30 carbon atoms.
- aromatic hydrocarbon group those having 6 to 18 nuclear carbon atoms are preferred, for example, a phenol group, 1 naphthyl group, 2 naphthyl group, 1 anthryl group, 2 anthryl group, 9-anthryl group, 1 phenanthryl group, 2 phenanthryl group, 3 phenanthryl group, 4 phenanthryl group, 9 phenanthryl group, 1 naphthacyl group, 2 naphthacyl group, 9-naphthalyl group, 1-pyrole group, 2 pyreth Group, 4-pyrole group, 2-biphenyl group, 3-biphenyl group, 4-biphenyl group, p-terferyl group, 4-terfyl group, p-terferyl group, 3-yl group, p Terferreux 2—yl group, m Terferreux 4 —yl group, m—Terferreux 3 —yl group, m—Terferreux 2 —yl
- a phenyl group 1 naphthyl group, 2 naphthyl group, 9 phenanthryl group, 2 biphenylyl group, 3 biphenylyl group, 4 biphenylyl group, p-tolyl group, 3, 4 Xylylenyl group and the like and divalent groups thereof.
- the heterocyclic group preferably has 3 to 18 nuclear atoms.
- 2 pyridyl group, 1-indolidinyl group, 2-indolizinyl group, 3-indolidyl group, 5-indolidyl group, 6-indolidyl group, 7-indolidyl group are preferable.
- Examples of the cycloalkyl group and cycloalkylene group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a 4-methylcyclohexyl group,
- Examples thereof include a 1-adamantyl group, a 2-adamantyl group, a 1 norbornyl group, a 2-norbornyl group and the like and divalent groups thereof.
- alkyl group and alkylene group those having 110 carbon atoms are preferable, for example, methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, s-butyl group, isobutyl group, t-butyl group.
- methyl, ethyl, propyl, isopropyl, n-butyl, sbutyl, isobutyl, tbutyl, n-pentyl, n-hexyl, and n- are preferred.
- the alkaryl group and the alkellene group are preferably those having 2 to 16 carbon atoms.
- bur group, aralkyl group, 1-butenyl group, 2 butenyl group, 3 butenyl group, 1, 3 Butane gel group 1-methyl beryl group, styryl group, 2,2 diphenyl beryl group, 1,2-diphenyl beryl group, 1-methyl beryl group, 1,1-dimethyl allyl group, 2-methyl beryl group 1-Furaryl group, 2-Feraryl group, 3-Feraryl group, 3, 3-Difuryl-Rulyl group, 1,2 Dimethylaryl group, 1-Fu-Lu 1-Butul group, 3-Fuenyl 1-Butenyl And a group having these as a divalent group, preferably a styryl group, a 2,2-diphenyl-vinyl group, a 1,2-diphenyl-vinyl group, and a divalent group thereof. It is a thing.
- Preferred examples of the aralkyl group and aralkylene group include those having 7 to 18 carbon atoms such as benzyl group, 1-phenylethyl group, 2-phenylethyl group, 1-phenylisopropyl group, 2 —Phenylisopropyl group, phenyl t-butyl group, ⁇ -naphthylmethyl group, 1 ⁇ -naphthylethyl group, 2-a naphthylethyl group, 1-a naphthylisopropyl group, 2-a naphthylisopropyl group, 13 naphthylmethyl group, 1 ⁇ — Naphthylethyl group, 2- ⁇ naphthylethyl group, 1- ⁇ naphthylisopropyl group, 2- ⁇ naphthylisopropyl group, 1 pyrrolylmethyl group, 2- (1 pyrrolyl) ethyl group, ⁇ -
- L 6 is a heterocyclic ring having 3 to 30 nuclear carbon atoms which may have a substituent, a carboxylic acid ester having 1 to 30 carbon atoms which may have a substituent, A carboxylic acid amide having 1 to 30 carbon atoms, an amine that may have a substituent, a phosphine that may have a substituent, an iso-tolyl that may have a substituent, and a substituent.
- heterocyclic ring examples include those in which the groups in the same examples as those described above for 1 to L 5 are zero-valent.
- carboxylic acid ester examples include methyl formate, ethyl formate, methyl acetate, ethyl acetate, methyl propionate, ethyl ethyl propionate, methyl benzoate, and benzoic acid.
- Examples of the carboxylic acid amide include N, N dimethylformamide, N, N dimethylacetamide, N, N dimethylbenzoic acid amide, N, N dimethyl-2-pyridine, rubonic acid amide, N, N dimethyl-3- Pyridinecarboxylic acid amide, N, N dimethyl-4-pyridinecarboxylic acid amide, N, N dimethylphenol acetate, N, N dimethyl-2-pyridine acetate, N, N dimethyl-3 pyridine acetate, N, N dimethyl Cyl-4 pyridineacetamide, N, N dimethyl-2-pyrrolecarboxylic acid amide, N, N dimethyl-3 pyrrolecarboxylic acid amide, N, N dimethyl-2-thiophenecarbonic acid amide, N, N dimethyl-3-thiophenecarboxylic acid amide , N-methylformamide, N-methylacetamide, N-methylbenzoic acid amide, N-methyl-2-pyridine Rubonic acid amide, N-methylform
- Examples of the amine include triethylenamine, tri-n-propylamine, tri-n-butyramine, N, N-dimethylaniline, methyldiphenylamine, triphenylamine, diamine.
- Examples of the phosphine include those in which nitrogen of the amine is replaced with phosphorus.
- iso-tolyl examples include butyl isocyanide, isobutyl isocyanide, sec-butyl isocyanide, t-butyl isocyanide, phenol isocyanide, 2-tolyl isocyanide, 3 tolyl isocyanide, 4 tolyl isocyanide, 2 pyridine isocyanide, 3 pyridine isocyanide. 4-pyridine isocyanide, benzyl isocyanide and the like.
- ether examples include jetyl ether, di- n -propyl ether, di-n-butinoleethenole, diisobutinoleethenole, di-sec butinoleethenole, di-t-butyl ether, anisole, diphenyl ether, furan, Tetrahydrofuran, dioxane and the like can be mentioned.
- Examples of the thioether include those obtained by replacing oxygen in the ether with sulfur.
- Examples of the compound having a double bond having 1 to 30 carbon atoms include ethylene, propylene, 1-butene, 1 pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene and 1 eicosene.
- L 1 and L 3 is preferably an aromatic hydrocarbon group or a heterocyclic group.
- a phenyl group and a substituted phenyl group are preferable among these, preferably the structures shown below.
- X represents an adjacent linking group, that is, L 2 or L 4 [Chemical 5]
- imidazole-2-ylidene, 1,2,4 triazole-1-ylidene and cyclic diaminocarbene are preferred, and imidazole-2-ylidene and 1,2,4 triazole-3 ylidene are more preferred.
- Specific structures are listed below.
- the A ring represents an adjacent linking group, that is, L 1 or L 3 .
- L 2 and L 4 are groups having no carbene carbon are listed below.
- the carbon bonded to L 1 or L 3 is preferably adjacent to the telo atom coordinated to the metal M, and the following examples may be substituted.
- Te contact in general formula (1), preferable of L 5, examples, preferred cited by L 1 and L 3, include the same examples, in the above example, except for the X More preferably.
- L 6 include a pyridine ring-containing group, a pyrrole ring-containing group, an imidazole ring-containing group, a pyrazole ring-containing group, a 1,2,3-triazole ring-containing group, and a 1,2,4-triazole ring-containing group. , Thiophene ring-containing group, furan ring-containing group, oxazole ring-containing group, thiazole ring-containing group, R 18 R 27 C
- R 29 CONR 3 ° R 31 R 18 to R 31 are each independently the same examples as R 1 and R 2, and each may be the same, different or cross-linked. And those having a structure of
- L 5 and L 6 are cross-linked, L 5 - if it is a L 6, which preferred examples of the L 5 and L 6 is cross-linking, and with the L 1 and L 3 wherein L 2 and preferred mentioned L 4, are the same as those of the examples.
- the transition metal complex compound represented by the general formula (1) of the present invention is preferably a transition metal complex compound having a metal carbene bond represented by the following general formula (2).
- the bond indicated by a solid line indicates a covalent bond
- the bond indicated by an arrow indicates a coordination bond
- at least one of L 2 ⁇ M and L 4 ⁇ M is The metal carbene bond is shown.
- M and ⁇ are the same as defined above.
- L 1 L 2 and L 3 — L 4 are bridged bidentate ligands
- L 5 and L 6 are each independently a monodentate ligand or a bridged bidentate ligand in which L 5 and L 6 are bridged ( 5 — 6 ), 1 and 3 , 1 and 4 , 2 and 3 , 2 and 4 , 1 and 5 , 1 and 6 , 2 and 5 , 2 and L 3 and L 5 , L 3 and L 6
- L At least one of 4 and L 5 and L 4 and L 6 is crosslinked via a crosslinking group Z 1 — (Z 1 is as defined above).
- n is an integer of 0 to 1
- n represents the valence of the metal M.
- L 3 to L 4 may be the same or different and may be bridged by adjacent ones.
- (L 1 L 2 ) M and Z or (L 3 — L 4 ) M is preferably a structure represented by the following general formula (3). ,.
- C (carbon atom) ⁇ M represents a metal carbene bond
- M is the same as described above.
- X is a nitrogen-containing group (NR 1 —), phosphorus-containing group (PR 1 —), oxygen (-0-) or sulfur (—S—), and Y is a nitrogen-containing group.
- NR 2 phosphorus-containing group
- PR oxygen-containing group
- one OR 1 oxygen-containing group
- sulfur-containing group one SR 1
- R 1 and R 2 are each independently a hydrogen atom, an optionally substituted alkyl group having 1 to 30 carbon atoms, or an optionally substituted halogenated alkyl group having 1 to 30 carbon atoms. May have an aromatic hydrocarbon group with 6 to 30 carbon atoms, or may have a substituent! Has a cycloalkyl group with 3 to 50 carbon atoms and a substituent. However, an aralkyl group having 7 to 40 carbon atoms, an alkenyl group having 2 to 30 carbon atoms which may have a substituent, and a heterocyclic group having 3 to 30 nuclear atoms which may have a substituent.
- alkyl group examples include those having 1 to 10 carbon atoms, such as methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, s-butyl group, isobutyl group, t-butyl group, and n-pentyl group.
- methyl, ethyl, propyl, isopropyl, n-butyl, sbutyl, isobutyl, tbutyl, n-pentyl, n-hexyl, and n- are preferred.
- Ptyl group Ptyl group, n-octyl group, n-nor group, n-decyl group, n-undecyl group, n-dodecyl group, n-tridecyl group, n-tetradecyl group, n-pentadecyl group, n-hexadecyl group, n —Heptadecyl group, n-octadecyl group, neopentyl group, 1-methylpentyl group, 1 pentylhexyl group, 1-butylpentyl group, 1-heptyloctyl group, cyclohexyl group, cyclooctyl group, 3,5-tetramethylcyclo Hexyl group.
- the halogenated alkyl group is preferably one having 1 to 10 carbon atoms.
- a chloromethyl group, a 1-chlorooctyl group, a 2-chloroethyl group, a 2-chloroisobutyl group 1 , 2-Dichlorodiethyl, 1,3 Dichlorodiethyl, 2,3 Dichloro-t-butyl, 1,2,3 Tricyclodipropyl, bromomethyl, 1 bromoethyl, 2 bromoethyl, 2 bromoisobutyl 1,2,2 dibromoethyl, 1,3 dibromoisopropyl, 2,3 dibutyl tert-butyl, 1,2,3 tribromopropyl, odomethyl, 1-odoethyl, 2-iodoethyl, 2-iodoisobutyl 1, 2—Jodoethyl group, 1,3 Jodoisopropy
- a fluoromethyl group preferred are a trifluoromethyl group, a pentafluoroethyl group, a perfluoroisopropyl group, a perfluorobutyl group, and a perfluorocyclohexyl group.
- the aromatic hydrocarbon group is preferably one having a nuclear carbon number of 6 to 18, for example, a phenol group, 1 naphthyl group, 2 naphthyl group, 1 anthryl group, 2 anthryl group, 9-a Tolyl, 1 phenanthryl, 2 phenanthryl, 3 phenanthryl, 4 phen Nantryl group, 9 Phenanthryl group, 1 Naphthase group, 2 Naphthase group, 9-Naphthase group, 1-Pyrel group, 2 Pyrel group, 4 Pyrel group, 2 Biphenyl group Group, 3-biphenyl group, 4-biphenyl group, p terferlu group 4-yl group, p terferol group 3-yl group, p turfer group two-yl group, m terferol group 4-yl group, m-Terferlu group 3-Myl group, m-Terferlu group 2-Myl
- a phenyl group 1 naphthyl group, 2 naphthyl group, 9 phenanthryl group, 2 biphenylyl group, 3 biphenylyl group, 4 biphenylyl group, p-tolyl group, 3, 4-Xylylenyl group.
- cycloalkyl group examples include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a 4-methylcyclohexyl group, a 1-adamantyl group, a 2-adamantyl group, a 1-norbornyl group, and a 2-norbornyl group. Groups and the like.
- aralkyl group those having 7 to 18 carbon atoms are preferred, for example, a benzyl group,
- the alkenyl group is preferably one having 2 to 16 carbon atoms, for example, a bur group, a allyl group, a 1-butur group, a 2 butur group, a 3 butur group, or a 1,3 butane group.
- examples include a ruaryl group, a 2-furaryl group, a 3-furaryl group, a 3,3 diphenyl-ruaryl group, a 1,2 dimethylaryl group, a 1-fluoro 1-butur group, and a 3-fluoro 1-butenyl group.
- they are a styryl group, a 2,2-divinylvinyl group, and a 1,2-diphenylvinyl group.
- the heterocyclic group preferably has 3 to 18 nuclear atoms.
- 2-pyridyl group 1-indolidyl group, 2-indolidyl group, 3-indolidyl group, 5-indolidyl group, 6-indolidyl group, 7 —Indolizyl group, 8 Indolizyl group, 2 Imidazopyridyl group, 3 Imidazopyridinyl group, 5 Imidazopyridinyl group, 6—Imidazopyridyl group, 7—Imidazopyridyl group, 8—Imidazopyridyl group Group, 3-pyridyl group, 4 pyridyl group, 1 indolyl group, 2 indolyl group, 3—indolyl group, 4 indolyl group, 5—indolyl group, 6—indolyl group, 7—in Drill group, 1-isoindolyl group, 2-isoindolyl group, 3-isoindolyl group, 4-isoindodolyl
- the alkoxy group and Ariruokishi group is a group represented by OX 1, is an example of X 1, same examples as those described for the alkyl group and Nono Rogeni spoon alkyl and Ariru group Is mentioned.
- the alkylamino group and the arylamino group are groups represented by —NX 1 X 2 , and examples of X 1 and X 2 are those described for the alkyl group, the halogenated alkyl group, and the aryl group, respectively. The same example is given.
- Examples of the carboxyl-containing group include methyl ester, ethyl ester, and butyester.
- alkylsilyl group examples include a trimethylsilyl group, a triethylsilyl group, a t-butyldimethylsilyl group, a butyldimethylsilyl group, and a propyldimethylsilyl group.
- arylsilyl group examples include a triphenylsilyl group, a phenyldimethylsilyl group, and a t-butyldiphenylsilyl group.
- Examples of the ring structure formed by crosslinking X and Y include the same examples as those given for the heterocyclic group.
- L 2 and L 4 is a carbene carbon Preferable LV mentioned in the case of having the same as the example.
- Z is an atom that forms a covalent bond with the metal M, and is a carbon, silicon, nitrogen, or phosphorus atom, and the A ring containing Z may be a nuclear carbon that may have a substituent. It is an aromatic heterocyclic group having 3 to 40 nuclear atoms which may have an aromatic hydrocarbon group having 3 to 40 or a substituent.
- Examples of this aromatic hydrocarbon group are the same as those mentioned above, and examples of this aromatic heterocyclic group include those which are aromatic heterocyclic groups among the examples of the heterocyclic group. Et It is.
- the ring A is preferably the same as the preferable examples given for L 1 and L 3 in the general formula (1).
- the compound represented by the general formula (1) or (2) is preferably a transition metal complex compound having a metal carbene bond represented by the following general formula (4).
- C (carbon atom) ⁇ M represents a metal carbene bond.
- M represents a metal atom of iridium (Ir) or platinum (Pt).
- k represents an integer of 1 to 3
- m represents an integer of 0 to 2
- k + m represents a valence of metal M.
- R 3 may have a substituent, an alkyl group having 1 to 30 carbon atoms, or a substituent. May have ⁇ 30 halogenated alkyl groups and substituents! Homonuclear may have 6-30 aromatic hydrocarbon groups and substituents !, C3-C30 cycloalkyl Group, optionally substituted aralkyl group having 7 to 40 carbon atoms, optionally having substituents, alkenyl group having 2 to 30 carbon atoms, optionally having substituents, 3 nuclear atoms A heterocyclic group of -30, an alkylsilyl group having 3-30 nuclear atoms, which may have a substituent, an arylsilylsilyl group having 6-30 carbons, which may have a substituent, and having 1-30 carbons It is a carboxyl-containing group.
- R 4 to R 17 are each independently a hydrogen atom, a halogen atom (fluorine, bromine, iodine, chlorine, etc.), a thiociano group, a cyano group, or a nitro group.
- a halogen atom fluorine, bromine, iodine, chlorine, etc.
- a thiociano group a cyano group, or a nitro group.
- a C3-C30 alkylamino group a C3-C30 alkylsilyl group which may have a substituent, and a C6-C30 arylyl group which may have a substituent.
- group and the carboxyl-containing group include the same examples as R 1 and R 2 in the general formula (3).
- C (carbon atom) ⁇ Ir represents a metal carbene bond.
- k, m, and ⁇ R 17 are the same as described above.
- At least two of the groups are cross-linked via a cross-linking group—Z 1 — (Z 1 is the same as above)
- the substituents of the groups in the general formulas (1) to (5) include substituted or unsubstituted aryl groups having 5 to 50 nuclear carbon atoms, and substituted or unsubstituted alkyl groups having 1 to 50 carbon atoms.
- Substituted or unsubstituted alkoxy groups having 1 to 50 carbon atoms substituted or unsubstituted aralkyl groups having 6 to 50 nuclear carbon atoms, substituted or unsubstituted aryloxy groups having 5 to 50 nuclear carbon atoms, substituted or unsubstituted Examples thereof include aryloxy groups having 5 to 50 nuclear carbon atoms, substituted or unsubstituted alkoxycarbon groups having 1 to 50 carbon atoms, amino groups, halogen atoms, cyano groups, nitro groups, hydroxyl groups, and carboxyl groups. .
- an alkyl group having 1 to 10 carbon atoms a cycloalkyl group having 5 to 7 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, and an alkyl group having 1 to 6 carbon atoms, and 5 to 7 carbon atoms are preferable.
- Cycloalkyl groups are more preferred methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, cyclopentyl
- Particularly preferred is the cyclohexyl group.
- the addition of the ligand may be divided into two steps (in any order) and synthesized in two steps.
- A is a bridged bidentate group consisting of L 11 — (Z 11 ) — L 12 and B is L 13 d
- L 11 —, L 13 —, and L 15 — are shared bonds to Ir (iridium) (L 11 — Ir, L 13 -Ir3 ⁇ 4 ⁇ L 15 -Ir) ⁇ L, L 12 ⁇ , L " ⁇ and L 16 ⁇ represents coordination bonds to Ir (L 12 ⁇ Ir, L ′′ ⁇ Ir and L 16 ⁇ Ir), respectively.
- X 1 is a bridging group having a non-cyclic structural force of atomic power ⁇ -18, and is a hydrogen atom, carbon atom, silicon atom, nitrogen atom, sulfur atom, oxygen atom. , Phosphorus atom and boron atom group power Selected nuclear power A trivalent residue of a constituent compound, which may have a substituent.
- Examples of such X 1 include any of the following structures:
- R examples include a hydrogen atom, a methyl group, an ethyl group, an n propyl group, an isopropyl group, an n butyl group, an isobutyl group, a sec butyl group, a t butyl group, and an n pentyl group.
- Group, n-hexyl group, cyclohexyl group, phenyl group, methoxy group, ethoxy group and the like are preferable hydrogen atom, methyl group, ethyl group, t-butyl group, and phenyl group are more preferable.
- Y 1 represents X and A
- Y 2 represents X and B
- Y 3 represents a bridging group that bonds X and C
- ⁇ 1 represents L U , L 12 or Z U and Y 2 are bonded to L 13 , L 14 or Z 12
- Y 3 is bonded to L 15 , L 16 or Z 13
- ⁇ 2 and ⁇ 3 are each independently a compound 2 composed of an atom selected from the group consisting of a hydrogen atom, a carbon atom, a silicon atom, a nitrogen atom, a sulfur atom, an oxygen atom, a phosphorus atom and a boron atom. It is a valent residue and may have a substituent.
- a, b and c each independently represent an integer of 0 to 0, Is preferable.
- the plural Y 1 Y 2 or Y 3 may be the same or different.
- R 1 and R 2 are the same as described above, and may be the same or different from each other.
- R 1 and R 2 may be cross-linked with X or may be cross-linked with R 1 and R 2 .
- each Y 1 each Y 2 and each Y 3 is the same as one CR ⁇ R 2 —, one SiR ⁇ R 2 —, one NR 1 —, one O—, one S —, 1 PR 1 — and 1 BR 1 — Power can be chosen at will.
- R 1 and R 2 between each ⁇ 2 and each ⁇ 3 may be bridged by R 1 and R 2 that bridge with X.
- Z 11 represents L 11 and L 12
- Z 12 represents L 13 and L 14
- Z 13 represents a bridging group that binds L 15 and L 16
- z u , z 12 and z 13 are each independently a divalent compound composed of atoms selected from the group forces of hydrogen atom, carbon atom, silicon atom, nitrogen atom, sulfur atom, oxygen atom, phosphorus atom and boron atom. And may have a substituent.
- Z 11 is directly bonded to Y 1
- z 12 is directly bonded to Y 2
- z 13 is directly bonded to Y 3
- z u , Z 12 and Z 13 are the corresponding trivalent Be the basis.
- d, e and f each independently represent an integer of 0 to 0, preferably 0 to 3.
- d, e, or f is plural, the plural Z U , Z 12 or Z 13 may be the same or different.
- L u , L 13 and L 15 may each independently have a substituent! Bivalent aromatic carbonization having 6 to 30 nuclear carbon atoms It may have a hydrogen group or a substituent! A bivalent heterocyclic group having 3 to 30 heteronuclear atoms, or a divalent carboxyl-containing group having 1 to 30 carbon atoms that may have a substituent.
- May have a divalent amino group or a hydroxyl group-containing hydrocarbon group or a substituent may have a cycloalkylene group having 3 to 50 nuclear carbon atoms, or may have a substituent !, carbon number
- An alkylene group having 1 to 30 carbon atoms, an optionally substituted alkylene group having 2 to 30 carbon atoms, and a substituent Is an aralkylene group having 7 to 40 carbon atoms which may have a group, and when L 11 is directly bonded to Y 1 , L 13 is directly bonded to ⁇ 2 or L 15 is directly bonded to ⁇ 3
- L U , L 13 and L 15 are each a corresponding trivalent group.
- divalent aromatic hydrocarbon groups divalent heterocyclic groups, divalent carboxyl-containing groups, cycloalkylene groups, alkylene groups, alkylene groups and aralkylene groups
- Preferred examples include the divalent examples of the aromatic hydrocarbon group, heterocyclic group, carboxyl-containing group, cycloalkyl group, alkyl group, alkenyl group and aralkyl group described above. The same can be mentioned.
- divalent Examples of the amino group or a hydroxyl group-containing hydrocarbon group, said L u, amino group, and a hydrogen atom is hydroxyl of the hydrocarbon group having the hydrocarbon groups represented by L 13 ⁇ beauty L 15 The one replaced by the group.
- the L U , L 13 and L 15 are aromatic hydrocarbon groups or heterocyclic groups.
- the following structures are preferable.
- -The ru group is preferred.
- Y represents an adjacent linking group, that is, L 12 , L 14 or L 16 .
- ⁇ L 14 and L 16 are each independently a monovalent group having a carbene carbon which may have a substituent, or a nuclear atom number which may have a substituent 3 to 3 30 monovalent heterocyclic group, L 12 is directly bonded to Y 1 , L 14 is directly bonded to Y 2 , or L 16 is directly bonded to Y 3 , L 12 , L "and L 16 are respectively a corresponding divalent group.
- L 12 , L" and L 16 at least one is preferably a group having a carbene carbon.
- a monovalent group having a carbene carbon a stable carbene is usually used together with a metal.
- Specific examples that are preferred to be formed include diarylcarbene, cyclic diaminocarbene, imidazole-2 ylidene, 1,2,4 triazole-3 ylidene, 1,3 thiazol-2-ylidene, acyclic diaminocarbene, Acyclic aminooxycarbene, acyclic aminothiocarbene, cyclic diborylcarbene, acyclic diborylcarbene, phosphinosylcarbene, phosphinophosphinocarbene, sulfenyltrifluoromethylcarbene, sulf-pentafluorothiocarbene, etc. Mention may be made of monovalent groups (reference: Chem. Rev. 2000, 100, p39).
- ring A represents an adjacent linking group, that is, L U , L 13 or L 15 .
- R j is the same as R 1 and R 2 described above.
- L 12 , L 14 and L 16 are groups having no carbene carbon, that is, examples of heterocyclic groups are listed below.
- the carbon bonded to L U , L 13 or L 15 is adjacent to the hetero atom coordinated to iridium, and the following examples may be substituted.
- the total of the atomic weights constituting the following crosslinking site (7) is preferably 200 or less, and more preferably 100 or less.
- the molecular weight of the complex decreases as the total atomic weight is reduced. It is advantageous to keep the purity high in the sublimation process when manufacturing the device. Therefore, by reducing the sum of the atomic weights of the crosslinking sites, increasing the purity of the complex or the purity of the organic EL device has an effect.
- each group in the general formula (6) includes a substituted or unsubstituted aryl group having 5 to 50 nuclear carbon atoms, a substituted or unsubstituted alkyl group having 1 to 50 carbon atoms, a substituted or unsubstituted group.
- an alkyl group having 1 to 10 carbon atoms a cycloalkyl group having 5 to 7 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, and an alkyl group having 1 to 6 carbon atoms, and 5 to 7 carbon atoms are preferable.
- Cycloalkyl groups are more preferred methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, n-pentyl, n-hexyl, cyclopentyl
- Particularly preferred is the cyclohexyl group.
- the organic EL device of the present invention is an organic EL device in which an organic thin film layer comprising at least one light-emitting layer or a plurality of layers is sandwiched between a pair of electrodes also having an anode and a cathode force.
- At least one layer of the transition metal complex compound contains the transition metal complex compound represented by any one of the general formulas (1), (2), (4), (5) and (6). It is preferable to contain a compound, and it is more preferable to contain a transition metal complex compound of the general formula (4) or (5).
- the content of the metal complex compound of the present invention in the organic thin film layer is usually 0.1 to L00% by weight and preferably 1 to 30% by weight with respect to the total mass of the light emitting layer. .
- the light emitting layer preferably contains the transition metal complex compound of the present invention as a light emitting material or a dopant.
- the light emitting layer can be thinned by vacuum deposition or coating, the production process can be simplified, so that the layer containing the transition metal complex compound of the present invention is formed by coating. This is preferable.
- the organic EL device of the present invention when the organic thin film layer is of a single layer type, the organic thin film layer is a light emitting layer, and this light emitting layer contains the transition metal complex compound of the present invention. Also many As a layer type organic EL device, (Anode Z Hole injection layer (Hole transport layer) Z Light emitting layer Z Cathode)
- Electron injection layer (electron transport layer) Z cathode) (Anode Z hole injection layer (hole transport layer) Z light-emitting layer Z electron injection layer (electron transport layer) Z cathode), etc. It is done.
- the anode of the organic EL device of the present invention supplies holes to a hole injection layer, a hole transport layer, a light emitting layer and the like, and it is effective to have a work function of 4.5 eV or more. is there.
- a material for the anode a metal, an alloy, a metal oxide, an electrically conductive compound, or a mixture thereof can be used.
- Specific examples of the material of the anode include conductive metal oxides such as tin oxide, zinc oxide, indium oxide, indium tin oxide (ITO), or metals such as gold, silver, chromium, nickel, and conductive materials thereof. Mixture or laminate of conductive metal oxide and metal
- Inorganic conductive materials such as copper iodide and copper sulfide, organic conductive materials such as polyarine, polythiophene, and polypyrrole, and laminates of these with ITO, preferably conductive metal oxides
- ITO inorganic conductive materials
- organic conductive materials such as polyarine, polythiophene, and polypyrrole
- laminates of these with ITO preferably conductive metal oxides
- ITO preferably conductive metal oxides
- the film thickness of the anode can be appropriately selected depending on the material.
- the cathode of the organic EL device of the present invention supplies electrons to an electron injection layer, an electron transport layer, a light emitting layer, and the like.
- the cathode material include metals, alloys, metal halides, metal oxides. , Electrically conductive compounds, or mixtures thereof.
- Specific examples of cathode materials include alkali metals (eg, Li, Na, K, etc.) and their fluorides or oxides, alkaline earth metals (eg, Mg, Ca, etc.), and their fluorides or oxides.
- aluminum and lithium-aluminum are preferable.
- the cathode may have a single layer structure of the material or a laminated structure of layers containing the material.
- a laminated structure of aluminum Z lithium fluoride and aluminum / lithium oxide is preferable.
- the film thickness of the cathode can be appropriately selected depending on the material.
- the hole injection layer and the hole transport layer of the organic EL device of the present invention inject holes from the anode cap. Any one having a function, a function of transporting holes, or a function of blocking the injected electrons from the cathode can be used. Specific examples thereof include strength rubazole derivatives, triazole derivatives, oxazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, phenylenediamine derivatives, arylamine amines, amino substituted chalcone derivatives, styrylanthracene.
- the hole injection layer and the hole transport layer may have a single layer structure composed of one or more of the materials, or a multilayer structure having a multi-layer force of the same composition or different compositions. It may be.
- the electron injection layer and the electron transport layer of the organic EL device of the present invention have any one of the function of injecting electrons from the cathode, the function of transporting electrons, and the function of blocking holes injected from the anode. What is necessary is just to have. Specific examples thereof include triazole derivatives, oxazol derivatives, oxadiazole derivatives, imidazole derivatives, fluorenone derivatives, anthraquinodimethane derivatives, anthrone derivatives, diphenylquinone derivatives, thiopyrandioxide derivatives, carpositimide derivatives, fluorenylidenemethane derivatives.
- Metal complexes of aromatic ring tetracarboxylic acid anhydrides such as distyrylvirazine derivatives, naphthalene and perylene, phthalocyanine derivatives, 8-quinolinol derivatives, metal phthalocyanines, metal complexes having benzoxazole and benzothiazole as ligands.
- Examples include various metal complexes, organosilane derivatives, and transition metal complex compounds of the present invention.
- the electron injection layer and the electron transport layer may have a single-layer structure composed of one or more of the materials, or a multilayer structure having a multi-layer force of the same composition or different compositions. Moyo.
- examples of the electron transport material used for the electron injection layer and the electron transport layer include the following compounds.
- the electron injection layer and the Z or electron transport layer contain a ⁇ electron deficient nitrogen-containing heterocyclic derivative as a main component.
- a nitrogen-containing 5-membered ring derivative selected from benzimidazole ring, benztriazole ring, pyridinoimidazole ring, pyrimidinoimidazole ring, pyridazinoimidazole ring,
- a nitrogen-containing 6-membered ring derivative composed of a pyridine ring, a pyrimidine ring, a pyrazine ring, or a triazine ring is preferred, and examples thereof include nitrogen-containing 5-membered ring derivatives having a structure represented by the following general formula ⁇ —I
- Preferred examples of the nitrogen-containing 6-membered ring derivative include structures represented by the following general formulas C—I, c—n, c—m, C—IV, Ji and Hide- ⁇ , and particularly preferred. Is a structure represented by general formulas CI and C-II.
- L B represents a divalent or higher linking group, preferably carbon, Keimoto, nitrogen, boron, oxygen, sulfur, metals, a linking group formed like a metal ion More preferably a carbon atom, a nitrogen atom, a carbon atom, a boron atom, an oxygen atom, a sulfur atom, an aromatic hydrocarbon ring or an aromatic heterocycle, and still more preferably a carbon atom, a carbon atom or an aromatic. It is a hydrocarbon ring or an aromatic hetero ring.
- L B is preferably an alkyl group as Yogu substituent may have a substituent, an alkenyl group, an alkynyl group, an aromatic hydrocarbon group, an amino group, an alkoxy group, Ariruokishi group, ⁇ sill group, an alkoxy Carbon group, aryloxycarbol group, acyloxy group, acylamino group, alkoxy carbolumino group, aryloxycarbolamino group, sulfo-lumino group, sulfamoyl group, rubamoyl group, alkylthio Group, aryl group, sulfonyl group, halogen atom, cyano group and aromatic heterocyclic group, more preferably alkyl group, aryl group, alkoxy group, aryloxy group, halogen atom, cyan group and aromatic heterocyclic group.
- an alkyl group More preferably an alkyl group, an aryl group, an alkoxy group, an aryloxy group, or an aromatic heterocyclic group. Particularly preferably an alkyl group, Ariru group, an alkoxy group, an aromatic heterocyclic group.
- [0091] include those of the following specific examples of the linking group represented by L B.
- R represents a hydrogen atom, an aliphatic hydrocarbon group, an aryl group, or a heterocyclic group.
- the aliphatic hydrocarbon group represented by R B2 is a linear, branched or cyclic alkyl group (preferably an alkyl group having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, particularly preferably 1 to 8 carbon atoms). And examples thereof include methyl, ethyl, iso-propyl, tert-butyl, n-octyl, n-decyl, n-hexadecyl, cyclopropyl, cyclopentyl, cyclohexyl and the like, and an alkenyl group (preferably).
- An alkyl group preferably an alkynyl group having 2 to 20 carbon atoms, more preferably 2 to 12 carbon atoms, particularly preferably 2 to 8 carbon atoms, such as a propargyl group, 3-pentynyl, etc. Group etc.
- More preferably an alkyl group More preferably an alkyl group.
- the aryl group represented by R B2 is a monocyclic or condensed aryl group, preferably having 6 to 6 carbon atoms. 30, more preferably an aryl group having 6 to 20 carbon atoms, and still more preferably 6 to 12 carbon atoms, such as, for example, a file, 2-methyl file, 3-methyl file, 4-methyl file, 2 -Methoxyphenyl, 3-trifluoromethylphenyl, pentafluorophenyl, 1-naphthyl, 2-naphthyl and the like.
- the heterocyclic group represented by R B2 is a monocyclic or condensed heterocyclic group (preferably having 1 to 20 carbon atoms, more preferably 1 to 12 carbon atoms, and further preferably 2 to 10 carbon atoms).
- Heteroaromatic group preferably an aromatic heterocyclic group containing at least one of a nitrogen atom, an oxygen atom, a sulfur atom, and a selenium atom, such as pyrrolidine, piperidine, piperazine, Morpholine, thiophene, selenophene, furan, pyrrole, imidazole, pyrazole, pyridine, pyrazine, pyridazine, pyrimidine, triazole, triazine, indole, indazole, purine, thiazoline, thiazole, thiadiazole, oxazoline, oxazole, oxadiazole, quinoline, Isoquinoline, phthalazine
- Aliphatic hydrocarbon group represented by R B2 Ariru group, heterocyclic group include the same device it may also have a substituent wherein L B.
- R B2 is preferably an alkyl group, an aryl group, or an aromatic heterocyclic group, more preferably an aryl group or an aromatic heterocyclic group, and still more preferably an aryl group.
- Z B2 represents an atomic group necessary for forming an aromatic ring.
- the aromatic ring formed by Z B2 is Specific examples of the aromatic hydrocarbon ring and the aromatic heterocycle include, for example, a benzene ring, a pyridine ring, a pyrazine ring, a pyrimidine ring, a pyridazine ring, a triazine ring, a pyrrole ring, a furan ring, and a thiophene ring.
- Selenophene ring, terorophene ring, imidazole ring, thiazole ring, selenazole ring, tellurazole ring, thiadiazole ring, oxadiazole ring, pyrazole ring, etc. preferably benzene ring, pyridine ring, pyrazine ring, pyrimidine ring, A pyridazine ring, more preferably a benzene ring, a pyridine ring, or a pyrazine ring.
- the aromatic ring formed by z B 2 may further form a condensed ring with another ring or may have a substituent.
- a substituent preferably an alkyl group, an alkyl group, an alkyl group, an aryl group, an amino group, an alkoxy group, an aryloxy group, an acyl group, an alkoxycarbonyl group, an arylcarbonyl group, an acyloxy group.
- acylamino group alkoxy carbo-lumino group, aryloxy carbo-lumino group, sulfo-lumino group, sulfamoyl group, strong rubamoyl group, alkylthio group, arylothio group, sulfol group, halogen atom, cyano group
- a heterocyclic group more preferably an alkyl group, an aryl group, an alkoxy group, an aryloxy group, a halogen atom, a cyano group, or a heterocyclic group, and even more preferably an alkyl group, an aryl group, an alkoxy group, an aryloxy group.
- aromatic heterocyclic group particularly preferably alkyl group, aryl group, alkoxy group.
- Ru heterocyclic group der aromatic.
- n B2 is an integer of 1 to 4, preferably 2 to 3.
- R B71 , R B72, and R B73 are the same as R B72 in general formula (BI), respectively, and the preferred ranges are also the same.
- Z B71, Z B72 and Zeta Beta73 are similar to Zeta B2 in the general formula (Beta iota) respectively, also are similar ranges have preferred.
- L B71, L B72 and L B73 each represent a linking group
- the general formula (B- I) can be mentioned those divalent examples of L B in, preferably, a single bond, a divalent aromatic hydrocarbon A hydrogen ring group, a divalent aromatic heterocyclic group, and a linking group having a combination force thereof, more preferably a single bond.
- L m , L B72 and L B73 may have a substituent. Examples of the substituent may be the same as L B in the general formula (BI).
- Y represents a nitrogen atom, a 1, 3, 5-benzenetriyl group or a 2, 4, 6-triazine triyl group.
- the 1, 3, 5-benzenetriyl group may have a substituent at the 2, 4, 6-position, and examples thereof include an alkyl group, an aromatic hydrocarbon ring group, and a halogen atom. It is possible.
- Cz is a substituted or unsubstituted carbazolyl group, aryl carbazolyl group or force rubazolylalkylene group
- A is a group formed from a site represented by the following general formula (A).
- n and m are integers from 1 to 3, respectively.
- M and M ′ are each independently a nitrogen-containing heteroaromatic ring having 2 to 40 carbon atoms to form a ring, and the ring may or may not have a substituent.
- M and M ' May be the same or different.
- L is a single bond, an arylene group having a carbon number of 630, a cycloalkylene group having a carbon number of 530, or a heteroaromatic ring having a carbon number of 230, even if it has a substituent bonded to the ring. It does not have to be.
- p is an integer of 0 2 q is 1 2 r is 0 2 However, p + r is 1 or more. ]
- the bonding mode of the group represented by the general formula (A) depends on the number of parameters p, q, r, specifically, the forms described in (1) to (16) in the following table. It is.
- Ar to Ar each represent the same group as R B2 in the general formula (B—I), and specific examples thereof are also the same.
- Ar to Ar represent divalent groups similar to R B2 in the general formula (B—I).
- the example is similar. )
- R to R each represent the same group as R B2 in the general formula (B—I), and specific examples thereof are also the same.
- an insulator or a semiconductor inorganic compound as a substance constituting the electron injection / transport layer. If the electron injection / transport layer is composed of an insulator or a semiconductor, current leakage can be effectively prevented and electron injection can be improved.
- an insulator it is preferable to use at least one metal compound selected from the group consisting of alkali metal chalcogenides, alkali earth metal chalcogenides, alkali metal halides, and alkaline earth metal halides. .
- the electron injection 'transport layer is composed of these alkali metal chalcogenides. If it has, it is preferable at the point which can improve an electron injection property further.
- alkali metal chalcogenides include, for example, Li 0, LiO, Na
- alkaline earth metal chalcogenides include
- alkali metal halide examples include LiF, NaF, KF, LiCl, KC1, and NaCl.
- alkaline earth metal halides examples include fluorides such as Ca F, BaF, SrF, MgF and BeF, and halides other than fluorides.
- the electron injection 'transport layer at least one of Ba, Ca, Sr, Yb, Al, Ga, In, Li, Na, Cd, Mg, Si, Ta, Sb, and Zn is used.
- the inorganic compound constituting the electron transport layer is preferably a microcrystalline or amorphous insulating thin film. If the electron transport layer is composed of these insulating thin films, a more uniform thin film is formed, and pixel defects such as dark spots can be reduced. Examples of such inorganic compounds include the alkali metal chalcogenides, alkaline earth metal chalcogenides, alkali metal halides, and alkaline earth metal halides described above.
- the electron injection layer and / or the electron transport layer may contain a reducing dopant having a work function of 2.9 eV or less.
- the reducing dopant is a compound that increases the electron injection efficiency.
- reducing dopants include alkali metal, alkaline earth metal oxide, alkaline earth metal, rare earth metal, alkali metal oxide, alkali metal halide, alkaline earth metal oxide, alkali It is at least one compound selected from the group consisting of earth metal halides, rare earth metal oxides or rare earth metal halides, alkali metal complexes, alkaline earth metal complexes, and rare earth metal complexes. More specifically, preferable reducing dopants include Na (work function: 2.
- a more preferable reducing dopant is at least one alkali metal selected from the group consisting of K, Rb, and Cs, more preferably Rb or Cs, and most preferably Cs. .
- alkaline earth metal oxides examples include BaO, SrO, CaO and Ba Sr O (0 ⁇ x ⁇ 1) mixed with these, Ba Ca O (0 ⁇ x ⁇ 1). are listed as preferred
- alkali oxides or fluorides examples include LiF, Li 0
- the alkali metal complex, alkaline earth metal complex, and rare earth metal complex are not particularly limited as long as they contain at least one of alkali metal ions, alkaline earth metal ions, and rare earth metal ions as metal ions.
- the ligand include quinolinol, benzoquinolinol, ataridinol, phenanthridinol, hydroxyphenylazole, hydroxyphenylthiazole, hydroxydiaryloxadiazole, hydroxydiarylthiadiazole, Hydroxyphenyl lysine, hydroxy phenyl benzimidazole, hydroxy benzotriazole, hydroxy fulborane, bipyridyl, phenanthorin, phthalocyanine, porphyrin, cyclopentagen, 13-diketones, azomethines, their derivatives, etc.
- the powers listed are not limited to these.
- the reducing dopant is formed in a layer shape or an island shape.
- the preferred film thickness is 0.05 to 8 nm.
- an organic substance that is a light-emitting material or an electron injecting material that forms an interface region is simultaneously deposited while a reducing dopant is deposited by resistance heating vapor deposition.
- a method in which a reducing dopant is dispersed therein is preferred.
- the dispersion concentration is 100: 1 to 1: 100, preferably 5: 1 to 1: 5 as a molar ratio. is there.
- the reducing dopant When forming the reducing dopant in layers, after forming the light emitting material or electron injecting material, which is an organic layer at the interface, into layers, the reducing dopant is vapor-deposited alone by resistance heating evaporation, preferably 0.5 nm in thickness. ⁇ ! Form at ⁇ 15nm.
- the reducing dopant When forming the reducing dopant in the form of an island, after forming the light emitting material or electron injecting material which is the organic layer at the interface, the reducing dopant is vapor-deposited by resistance heating evaporation method, preferably 0.05 to ln. Form with m.
- the light-emitting layer of the organic EL device of the present invention can inject holes from the anode or the hole injection layer when an electric field is applied, and can inject electrons from the cathode or the electron injection layer. It provides a function to move the generated charges (electrons and holes) by the force of an electric field, a field for recombination of electrons and holes, and a function to connect this to light emission.
- the light emitting layer of the organic EL device of the present invention may contain a host material using the transition metal complex compound as a guest material, which preferably contains at least the transition metal complex compound of the present invention.
- the host material examples include those having a force rubazole skeleton, those having a diarylamine skeleton, those having a pyridine skeleton, those having a pyrazine skeleton, those having a triazine skeleton, and those having an allylsilane skeleton. . It is preferable that the T1 (minimum triplet excited state energy level) of the host material is larger than the T1 level of the guest material.
- the host material may be a low molecular compound or a high molecular compound.
- the light emitting material such as the transition metal complex compound
- a method for forming each layer is not particularly limited, but a vacuum evaporation method, an LB method, a resistance heating evaporation method, an electron beam method, a sputtering method, a molecular lamination method, and the like.
- Various methods such as a coating method (spin coating method, casting method, dip coating method, etc.), an ink jet method, and a printing method can be used.
- a coating method that is a coating method is preferred.
- the organic thin film layer containing the transition metal complex compound of the present invention can be prepared by vacuum deposition, molecular beam deposition (MBE), solution dating, solvent coating, spin coating, casting, bar coating.
- MBE molecular beam deposition
- Known methods by coating methods such as coating and roll coating Can be formed.
- the coating method can be formed by dissolving the transition metal complex compound of the present invention in a solvent to prepare a coating solution, and coating and drying the coating solution on a desired layer (or electrode). .
- rosin which may contain rosin can be dissolved in a solvent or dispersed.
- a non-conjugated polymer for example, polyvinyl carbazole
- a conjugated polymer for example, a polyolefin polymer
- each organic layer of the organic EL element of the present invention is not particularly limited, but generally, if the film thickness is too thin, defects such as pinholes are generated, and conversely, if it is too thick, a high applied voltage is required and efficiency increases. Usually, the range of several nm to 1 ⁇ m is preferable because of worsening.
- the bridged ligand precursor (compound a) was synthesized in the following reaction process.
- the ligand precursor (compound was synthesized in the following reaction process.
- N-Phenol-o-Phenylenediamine 9.21 g (Molecular weight 184.24, 50 mmol) was added 100 ml of benzene, then formic acid 4.60 g (Molecular weight 46.03, 100 mmol) Add A solid is immediately formed by stirring at room temperature. Then, react for 2 hours under reflux. After completion of the reaction, toluene was distilled off under reduced pressure, and the target product (N-phenol pentimidazole) was subjected to silica gel column chromatography (developing solvent: methylene chloride 95% Z methanol 5%, Rf value about 0.2). It refine
- the transition metal complex compound 1 was synthesized in the following reaction process.
- the measurement conditions of FD-MS measurement were as follows.
- carbene carbon species in the imidazole-2 ylidene moiety 177.42ppm, 175.77ppm, 175.07ppm, 173.22ppm
- carbene carbon in the benzoimidazole-2-ylidene moiety was classified into two types (190.38ppm, 185.84ppm).
- the ligand (compound d) was synthesized in the following reaction process.
- Comparative compound 1 was synthesized in the following reaction process.
- Facial body A transition metal complex compound that also has an octahedral structural force. When there are three equivalent ligands, each structure forms an angle of 90 degrees with each other on the same side
- meridional A structure in which two of the three equivalent ligands form an angle of 180 degrees with each other in a transition metal complex compound that also has an octahedral structure.
- Comparative compound 2 was synthesized in the following reaction process.
- the ligand (I compound f) was synthesized in the following reaction process.
- the transition metal complex compound 2 was synthesized in the following reaction process.
- the maximum emission peak wavelengths ( ⁇ max) were 388 nm and 407 nm.
- the transition metal complex compound 3 was synthesized in the following reaction process.
- the maximum emission peak wavelength was 449 nm.
- the obtained transition metal complex compound 3 was a mixture of two isomers (facial and meridional).
- the emission wavelength can be increased by linking (crosslinking) the ligands of the complex.
- This phenomenon is useful as a technique capable of adjusting the emission wavelength to a desired one, and is particularly useful for leading a material having an emission wavelength in the ultraviolet region to a material having emission in the blue region.
- the organic EL device using the transition metal complex compound of the present invention is a material for an organic EL device that requires high emission efficiency, long emission lifetime, and blue emission. As extremely useful.
- the transition metal complex compound of the present invention is a compound that has been introduced into a material that emits light in the blue region by converting the molecular skeleton of a material that has an emission wavelength in the ultraviolet region. .
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Abstract
Description
Claims
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US11/997,931 US20100219397A1 (en) | 2005-08-05 | 2006-07-31 | Transition metal complex compound and organic electroluminescent device using same |
JP2007529491A JPWO2007018067A1 (ja) | 2005-08-05 | 2006-07-31 | 遷移金属錯体化合物及びそれを用いた有機エレクトロルミネッセンス素子 |
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KR20080037006A (ko) | 2008-04-29 |
US20100219397A1 (en) | 2010-09-02 |
JPWO2007018067A1 (ja) | 2009-02-19 |
TW200714608A (en) | 2007-04-16 |
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